Can someone explain this to me please? It would be so much help : )

Answer question above and explain each step : )

The scale for a map is 20 miles = 1/2 inch. the distance between two towns on the map is 3 3/4 inches. what is the actual distance between these towns? 150 miles 38 miles 75 miles 135 miles

To prove that def ~ gfh by the sss similarity theorem using the information provided in the diagram, it would be enough additional information to know that